Pilot signals for synchronization and/or channel estimation

• US 7,012,906 B1
• Filed: 03/14/2000
• Issued: 03/14/2006
• Est. Priority Date: 03/15/1999
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Information & Communications Ltd. (LG Corporation)
• Inventors: Song, Young-Joon
• Primary Examiner(s): LEE, CHI HO A
• Application Number:
  US09/525,446
• Time in Patent Office: 2,191 Days
• Field of Search: 370/335, 370/320, 370/342, 370/350, 370/500, 370/510, 370/512, 370/514, 370/509, 370/503, 375/354, 375/356, 375/357, 375/362, 375/368, 375/149, 375/150
• US Class Current: 370/335
• CPC Class Codes: H04B 1/70735 Code identification H04B1/7083 takes precedence
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04J 3/0605 Special codes used as synchronising signal
• CPC Class Codes: H04W 56/0085 detecting a given structure in the signal

Abstract

The frame words of the preferred embodiment are especially suitable for frame synchronization and/or channel estimation. By adding the autocorrelation and cross-correlation functions of frame words, double maximum values equal in magnitude and opposite polarity at zero and middle shifts are obtained. This property can be used to slot- by-slot, double-check frame synchronization timing, single frame synchronization and/or channel estimation and allows reduction of the synchronization search time. Further, the present invention allows a simpler construction of a correlator circuit for a receiver.

Claims

1. A communication device, comprising:

means for establishing frame synchronization for at least one of a radio link or a channel; and

means for generating at least one frame synchronization word, said at least one word comprises at least one of the following pilot bit pattern, each bit of each pilot bit pattern being provided within a corresponding slot of a frame having 15 slots;

Slot No1 2 3 4 . . . 15Pilot bit pattern 1 =(1 0 0 0 1 1 1 1 0 1 0 1 1 0

     0)Pilot bit pattern 2 =(1 0 1 0 0 1 1 0 1 1 1 0 0 0

     0)Pilot bit pattern 3 =(1 1 0 0 0 1 0 0 1 1 0 1 0 1

     1)Pilot bit pattern 4 =(0 0 1 0 1 0 0 0 0 1 1 1 0 1

     1)Pilot bit pattern 5 =(1 1 1 0 1 0 1 1 0 0 1 0 0 0

     1)Pilot bit pattern 6 =(1 1 0 1 1 1 0 0 0 0 1 0 1 0

     0)Pilot bit pattern 7 =(1 0 0 1 1 0 1 0 1 1 1 1 0 0

     0)Pilot bit pattern 8 =(0 0 0 0 1 1 1 0 1 1 0 0 1 0

     1)

wherein the at least one synchronization word has maximum correlation results of opposite polarities at time shifts of zero and seven of a correlation period.

2. The communication device of claim 1, wherein the maximum correlation result at time shift of zero is a result of autocorrelation.

3. The communication device of claim 2, wherein the maximum correlation result at time shift of seven is a result of cross-correlation.

4. The communication device of claim 1, wherein the at least one frame synchronization word allows confirmation of frame synchronization.

5. The communication device of claim 1, further comprising means for transmitting the at least one frame synchronization word within the frame of a dedicated physical control channel.

6. The communication device of claim 1, wherein a correlation result is the same at time shift of 15 as time shift of 0.

7. The communication device of claim 1, further comprising means for establishing chip synchronization for at least one of the radio link or the channel.

8. The communication device of claim 1 or 7, wherein the establishing means establishes at least one of chip or frame synchronization using offset information of a common control physical channel.